.box {
  width: 100%;
  height: 100%;
}

.box-size {
  box-sizing: border-box;
}

.fl {
  float: left;
}

.fr {
  float: right
}

.clearB::after {
  content: "";
  display: block;
  clear: both;
}

.pa {
  position: absolute
}

.pr {
  position: relative;
}

.center {
  text-align: center;
}

.white-space {
  overflow: hidden;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.hover:hover {
  opacity: .8;
  cursor: pointer;
}